A rotary encoder and displacement measuring device

Abstract

The application discloses a rotary encoder and a displacement measuring device, including: a ladder-shaped code disc, a light source, and a reading head. Counting; this application changes the original circular code track to a trapezoidal code track with an angle, so that the light beam enters the trapezoidal code track at an angle, and then reflects to the reading head, so that the beam is irradiated horizontally on the code track The area change is changed to the change of the irradiation area in the vertical direction, and the change in the vertical direction will not cause the beam to irradiate the wrong code track, thus avoiding the measurement error caused by radial runout and improving the stability of the rotary encoder sex.

Description

technical field [0001] The invention relates to the field of photoelectric ranging, in particular to a rotary encoder and a displacement measuring device. Background technique [0002] The rotary encoder is a sensor that converts the displacement of the rotating machine into an electrical signal, and detects the position, speed, etc. after the electrical signal is processed. It is mainly used for the measurement of angle, displacement, etc. in industrial automation. The requirements for accuracy and accuracy are getting higher and higher; in order to obtain the rotational displacement of the measured object, the most commonly used method is to use a rotary encoder to measure. The rotary encoder includes a reading head, a code disc and a light source. The reading head is used to obtain The light beam reflected by the code track on the code wheel irradiated by the light source is usually divided into two types: incremental type and absolute type according to the different meas...

AI Technical Summary

Problems solved by technology

[0003] Existing rotary encoders often have radial runouts of the code disc during high-speed operation, and these runouts will affect the irradiation range of the light source on the code track, see figure 1 As shown, before the radial runout of the code disc, the irradiation range of the light source on the code track 1 is 2, and after the radial runout of the code disc, the irradiation range of the light source on the code track 1 changes to 3, causing the reading head to receive the beam reflected by the wrong code track, Eventually lead to a large error in the measurement

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